Saturday 1 February 2014 11.32 EST
First published on Saturday 1 February 2014 11.32 EST

Arsenal are assessing a back injury to their new signing Kim Kallstrom, it is understood. The 31-year-old midfielder moved to the Emirates Stadium on a loan deal until the end of the season on Friday and his arrival was the only incoming business concluded by the Gunners during the transfer window.

Reports in Sweden on Saturday morning suggested that the former Lyon man had suffered a long-term injury during his first training session, claiming he could miss a large part of his temporary stay at Arsenal.

However, it appears the seriousness of Kallstrom's injury is yet to be determined by the club, who will be hoping to have him available as soon as possible with fellow midfielders Jack Wilshere and Aaron Ramsey also injured and Mathieu Flamini serving a four-game ban.

Arsène Wenger's side enter an important month in their search for silverware and, after a home game against Crystal Palace on Sunday, face a daunting schedule including Premier League and FA Cup tussles with Liverpool, a league visit from Manchester United and the opening leg of their Champions League tie against the holders, Bayern Munich.